Commit 523f1dce authored by Daniel Mack's avatar Daniel Mack Committed by Jaroslav Kysela
Browse files

[ALSA] Add Native Instrument usb audio device support 



Add snd-usb-caiaq driver to support caiaq usb-audio devices from
Native Instrument:
	* Native Instruments RigKontrol2
	* Native Instruments Kore Controller
	* Native Instruments Audio Kontrol 1
	* Native Instruments Audio 8 DJ

Signed-off-by: default avatarDaniel Mack <daniel@caiaq.org>
Signed-off-by: default avatarKarsten Wiese <fzu@wemgehoertderstaat.de>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
Signed-off-by: default avatarJaroslav Kysela <perex@suse.cz>
parent e24a121a

Documentation/sound/alsa/ALSA-Configuration.txt

+11 −0
Original line number Diff line number Diff line
@@ -1697,6 +1697,17 @@ Prior to version 0.9.0rc4 options had a 'snd_' prefix. This was removed. 


    This module supports multiple devices, autoprobe and hotplugging.



  Module snd-usb-caiaq

  --------------------



    Module for caiaq UB audio interfaces,

	    * Native Instruments RigKontrol2

	    * Native Instruments Kore Controller

	    * Native Instruments Audio Kontrol 1

	    * Native Instruments Audio 8 DJ



    This module supports multiple devices, autoprobe and hotplugging.



  Module snd-usb-usx2y

  --------------------

sound/usb/Kconfig

+28 −0
Original line number Diff line number Diff line
@@ -29,5 +29,33 @@ config SND_USB_USX2Y 
	  To compile this driver as a module, choose M here: the module

	  will be called snd-usb-usx2y.



config SND_USB_CAIAQ

	tristate "Native Instruments USB audio devices"

	 depends on SND && USB

	 select SND_HWDEP

	 select SND_RAWMIDI

	 select SND_PCM

	 help

	   Say Y here to include support for caiaq USB audio interfaces,

	   namely:



	    * Native Instruments RigKontrol2

	    * Native Instruments Kore Controller

	    * Native Instruments Audio Kontrol 1

	    * Native Instruments Audio 8 DJ



	   To compile this driver as a module, choose M here: the module

	   will be called snd-usb-caiaq.



config SND_USB_CAIAQ_INPUT

	bool "enable input device for controllers"

	depends on SND_USB_CAIAQ

	help

	  Say Y here to support input controllers like buttons, knobs,

	  alpha dials and analog pedals on the following products:



	   * Native Instruments RigKontrol2

	   * Native Instruments Audio Kontrol 1



endmenu

sound/usb/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -9,4 +9,4 @@ snd-usb-lib-objs := usbmidi.o 
obj-$(CONFIG_SND_USB_AUDIO) += snd-usb-audio.o snd-usb-lib.o

obj-$(CONFIG_SND_USB_USX2Y) += snd-usb-lib.o



obj-$(CONFIG_SND) += usx2y/
 
obj-$(CONFIG_SND) += usx2y/ caiaq/

sound/usb/caiaq/Makefile

0 → 100644
+3 −0
Original line number Diff line number Diff line 
snd-usb-caiaq-objs := caiaq-device.o caiaq-audio.o caiaq-midi.o caiaq-input.o



obj-$(CONFIG_SND_USB_CAIAQ) += snd-usb-caiaq.o

sound/usb/caiaq/caiaq-audio.c

0 → 100644
+706 −0
Original line number Diff line number Diff line 
/*

 *   Copyright (c) 2006,2007 Daniel Mack, Karsten Wiese

 *

 *   This program is free software; you can redistribute it and/or modify

 *   it under the terms of the GNU General Public License as published by

 *   the Free Software Foundation; either version 2 of the License, or

 *   (at your option) any later version.

 *

 *   This program is distributed in the hope that it will be useful,

 *   but WITHOUT ANY WARRANTY; without even the implied warranty of

 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 *   GNU General Public License for more details.

 *

 *   You should have received a copy of the GNU General Public License

 *   along with this program; if not, write to the Free Software

 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA

*/



#include <sound/driver.h>

#include <linux/init.h>

#include <linux/module.h>

#include <linux/moduleparam.h>

#include <linux/interrupt.h>

#include <linux/usb.h>

#include <linux/spinlock.h>

#include <sound/core.h>

#include <sound/initval.h>

#include <sound/pcm.h>

#include <sound/rawmidi.h>

#ifdef CONFIG_SND_USB_CAIAQ_INPUT

#include <linux/input.h>

#endif



#include "caiaq-device.h"

#include "caiaq-audio.h"



#define N_URBS			32

#define CLOCK_DRIFT_TOLERANCE	5

#define FRAMES_PER_URB		8

#define BYTES_PER_FRAME		512

#define CHANNELS_PER_STREAM	2

#define BYTES_PER_SAMPLE	3

#define BYTES_PER_SAMPLE_USB	4

#define MAX_BUFFER_SIZE		(128*1024)

				 

#define ENDPOINT_CAPTURE	2

#define ENDPOINT_PLAYBACK	6



#define MAKE_CHECKBYTE(dev,stream,i) \

	(stream << 1) | (~(i / (dev->n_streams * BYTES_PER_SAMPLE_USB)) & 1)



static struct snd_pcm_hardware snd_usb_caiaq_pcm_hardware = {

	.info 		= (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED | 

			   SNDRV_PCM_INFO_BLOCK_TRANSFER),

	.formats 	= SNDRV_PCM_FMTBIT_S24_3BE,

	.rates 		= (SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 | 

			   SNDRV_PCM_RATE_96000),

	.rate_min	= 44100,

	.rate_max	= 0, /* will overwrite later */

	.channels_min	= CHANNELS_PER_STREAM,

	.channels_max	= CHANNELS_PER_STREAM,

	.buffer_bytes_max = MAX_BUFFER_SIZE,

	.period_bytes_min = 4096,

	.period_bytes_max = MAX_BUFFER_SIZE,

	.periods_min	= 1,

	.periods_max	= 1024,

};



static void

activate_substream(struct snd_usb_caiaqdev *dev,

	           struct snd_pcm_substream *sub)

{

	if (sub->stream == SNDRV_PCM_STREAM_PLAYBACK)

		dev->sub_playback[sub->number] = sub;

	else

		dev->sub_capture[sub->number] = sub;

}



static void 

deactivate_substream(struct snd_usb_caiaqdev *dev,

		     struct snd_pcm_substream *sub)

{

	if (sub->stream == SNDRV_PCM_STREAM_PLAYBACK)

		dev->sub_playback[sub->number] = NULL;

	else

		dev->sub_capture[sub->number] = NULL;

}



static int

all_substreams_zero(struct snd_pcm_substream **subs)

{

	int i;

	for (i = 0; i < MAX_STREAMS; i++)

		if (subs[i] != NULL)

			return 0;

	return 1;

}



static int stream_start(struct snd_usb_caiaqdev *dev)

{

	int i, ret;



	debug("stream_start(%p)\n", dev);

	spin_lock_irq(&dev->spinlock);

	if (dev->streaming) {

		spin_unlock_irq(&dev->spinlock);

		return -EINVAL;

	}



	dev->input_panic = 0;

	dev->output_panic = 0;

	dev->first_packet = 1;

	dev->streaming = 1;



	for (i = 0; i < N_URBS; i++) {

		ret = usb_submit_urb(dev->data_urbs_in[i], GFP_ATOMIC);

		if (ret) {

			log("unable to trigger initial read #%d! (ret = %d)\n",

				i, ret);

			dev->streaming = 0;

			spin_unlock_irq(&dev->spinlock);

			return -EPIPE;

		}

	}

	

	spin_unlock_irq(&dev->spinlock);

	return 0;

}



static void stream_stop(struct snd_usb_caiaqdev *dev)

{

	int i;

	

	debug("stream_stop(%p)\n", dev);

	if (!dev->streaming)

		return;

	

	dev->streaming = 0;

	for (i = 0; i < N_URBS; i++) {

		usb_unlink_urb(dev->data_urbs_in[i]);

		usb_unlink_urb(dev->data_urbs_out[i]);

	}

}



static int snd_usb_caiaq_substream_open(struct snd_pcm_substream *substream)

{

	struct snd_usb_caiaqdev *dev = snd_pcm_substream_chip(substream);

	debug("snd_usb_caiaq_substream_open(%p)\n", substream);

	substream->runtime->hw = dev->pcm_info;

	snd_pcm_limit_hw_rates(substream->runtime);

	return 0;

}



static int snd_usb_caiaq_substream_close(struct snd_pcm_substream *substream)

{

	struct snd_usb_caiaqdev *dev = snd_pcm_substream_chip(substream);



	debug("snd_usb_caiaq_substream_close(%p)\n", substream);

	if (all_substreams_zero(dev->sub_playback) &&

	    all_substreams_zero(dev->sub_capture)) {

		/* when the last client has stopped streaming, 

		 * all sample rates are allowed again */

		stream_stop(dev);

		dev->pcm_info.rates = dev->samplerates;

	}

	

	return 0;

}



static int snd_usb_caiaq_pcm_hw_params(struct snd_pcm_substream *sub,

			     		struct snd_pcm_hw_params *hw_params)

{

	debug("snd_usb_caiaq_pcm_hw_params(%p)\n", sub);

	return snd_pcm_lib_malloc_pages(sub, params_buffer_bytes(hw_params));

}



static int snd_usb_caiaq_pcm_hw_free(struct snd_pcm_substream *sub)

{

	struct snd_usb_caiaqdev *dev = snd_pcm_substream_chip(sub);

	debug("snd_usb_caiaq_pcm_hw_free(%p)\n", sub);

	spin_lock_irq(&dev->spinlock);

	deactivate_substream(dev, sub);

	spin_unlock_irq(&dev->spinlock);

	return snd_pcm_lib_free_pages(sub);

}



/* this should probably go upstream */

#if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12

#error "Change this table"

#endif



static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,

                                 48000, 64000, 88200, 96000, 176400, 192000 };



static int snd_usb_caiaq_pcm_prepare(struct snd_pcm_substream *substream)

{

	int bytes_per_sample, bpp, ret, i;

	int index = substream->number;

	struct snd_usb_caiaqdev *dev = snd_pcm_substream_chip(substream);

	struct snd_pcm_runtime *runtime = substream->runtime;



	debug("snd_usb_caiaq_pcm_prepare(%p)\n", substream);

	

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)

		dev->audio_out_buf_pos[index] = BYTES_PER_SAMPLE + 1;

	else

		dev->audio_in_buf_pos[index] = 0;

	

	if (dev->streaming)

		return 0;

	

	/* the first client that opens a stream defines the sample rate

	 * setting for all subsequent calls, until the last client closed. */

	for (i=0; i < ARRAY_SIZE(rates); i++)

		if (runtime->rate == rates[i])

			dev->pcm_info.rates = 1 << i;

	

	snd_pcm_limit_hw_rates(runtime);



	bytes_per_sample = BYTES_PER_SAMPLE;

	if (dev->spec.data_alignment == 2)

		bytes_per_sample++;

	

	bpp = ((runtime->rate / 8000) + CLOCK_DRIFT_TOLERANCE)

		* bytes_per_sample * CHANNELS_PER_STREAM * dev->n_streams;

	

	ret = snd_usb_caiaq_set_audio_params(dev, runtime->rate,

					     runtime->sample_bits, bpp);

	if (ret)

		return ret;



	ret = stream_start(dev);

	if (ret)

		return ret;

	

	dev->output_running = 0;

	wait_event_timeout(dev->prepare_wait_queue, dev->output_running, HZ);

	if (!dev->output_running) {

		stream_stop(dev);

		return -EPIPE;

	}



	return 0;

}



static int snd_usb_caiaq_pcm_trigger(struct snd_pcm_substream *sub, int cmd)

{

	struct snd_usb_caiaqdev *dev = snd_pcm_substream_chip(sub);



	switch (cmd) {

	case SNDRV_PCM_TRIGGER_START:

	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:

		spin_lock(&dev->spinlock);

		activate_substream(dev, sub);

		spin_unlock(&dev->spinlock);

		break;

	case SNDRV_PCM_TRIGGER_STOP:

	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:

		spin_lock(&dev->spinlock);

		deactivate_substream(dev, sub);

		spin_unlock(&dev->spinlock);

		break;

	default:

		return -EINVAL;

	}



	return 0;

}



static snd_pcm_uframes_t

snd_usb_caiaq_pcm_pointer(struct snd_pcm_substream *sub)

{

	int index = sub->number;

	struct snd_usb_caiaqdev *dev = snd_pcm_substream_chip(sub);



	if (dev->input_panic || dev->output_panic)

		return SNDRV_PCM_POS_XRUN;



	if (sub->stream == SNDRV_PCM_STREAM_PLAYBACK)

		return bytes_to_frames(sub->runtime, 

					dev->audio_out_buf_pos[index]);

	else

		return bytes_to_frames(sub->runtime,

					dev->audio_in_buf_pos[index]);

}



/* operators for both playback and capture */

static struct snd_pcm_ops snd_usb_caiaq_ops = {

	.open =		snd_usb_caiaq_substream_open,

	.close =	snd_usb_caiaq_substream_close,

	.ioctl =	snd_pcm_lib_ioctl,

	.hw_params =	snd_usb_caiaq_pcm_hw_params,

	.hw_free =	snd_usb_caiaq_pcm_hw_free,

	.prepare =	snd_usb_caiaq_pcm_prepare,

	.trigger =	snd_usb_caiaq_pcm_trigger,

	.pointer =	snd_usb_caiaq_pcm_pointer

};

	

static void check_for_elapsed_periods(struct snd_usb_caiaqdev *dev,

				      struct snd_pcm_substream **subs)

{

	int stream, pb, *cnt;

	struct snd_pcm_substream *sub;



	for (stream = 0; stream < dev->n_streams; stream++) {

		sub = subs[stream];

		if (!sub)

			continue;



		pb = frames_to_bytes(sub->runtime, 

				     sub->runtime->period_size);

		cnt = (sub->stream == SNDRV_PCM_STREAM_PLAYBACK) ?

					&dev->period_out_count[stream] :

					&dev->period_in_count[stream];



		if (*cnt >= pb) {

			snd_pcm_period_elapsed(sub);

			*cnt %= pb;

		}

	}

}



static void read_in_urb_mode0(struct snd_usb_caiaqdev *dev,

			      const struct urb *urb,

			      const struct usb_iso_packet_descriptor *iso)

{

	unsigned char *usb_buf = urb->transfer_buffer + iso->offset;

	struct snd_pcm_substream *sub;

	int stream, i;



	if (all_substreams_zero(dev->sub_capture))

		return;



	spin_lock(&dev->spinlock);

	

	for (i = 0; i < iso->actual_length;) {

		for (stream = 0; stream < dev->n_streams; stream++, i++) {

			sub = dev->sub_capture[stream];

			if (sub) {

				struct snd_pcm_runtime *rt = sub->runtime;

				char *audio_buf = rt->dma_area;

				int sz = frames_to_bytes(rt, rt->buffer_size);

				audio_buf[dev->audio_in_buf_pos[stream]++] 

					= usb_buf[i];

				dev->period_in_count[stream]++;

				if (dev->audio_in_buf_pos[stream] == sz)

					dev->audio_in_buf_pos[stream] = 0;

			}

		}

	}

	

	spin_unlock(&dev->spinlock);

}



static void read_in_urb_mode2(struct snd_usb_caiaqdev *dev,

			      const struct urb *urb,

			      const struct usb_iso_packet_descriptor *iso)

{

	unsigned char *usb_buf = urb->transfer_buffer + iso->offset;

	unsigned char check_byte;

	struct snd_pcm_substream *sub;

	int stream, i;



	spin_lock(&dev->spinlock);

	

	for (i = 0; i < iso->actual_length;) {

		if (i % (dev->n_streams * BYTES_PER_SAMPLE_USB) == 0) {

			for (stream = 0; 

			     stream < dev->n_streams; 

			     stream++, i++) {

				if (dev->first_packet)

					continue;



				check_byte = MAKE_CHECKBYTE(dev, stream, i);

				

				if ((usb_buf[i] & 0x3f) != check_byte)

					dev->input_panic = 1;



				if (usb_buf[i] & 0x80)

					dev->output_panic = 1;

			}

		}

		dev->first_packet = 0;



		for (stream = 0; stream < dev->n_streams; stream++, i++) {

			sub = dev->sub_capture[stream];

			if (sub) {

				struct snd_pcm_runtime *rt = sub->runtime;

				char *audio_buf = rt->dma_area;

				int sz = frames_to_bytes(rt, rt->buffer_size);

				audio_buf[dev->audio_in_buf_pos[stream]++] 

					= usb_buf[i];

				dev->period_in_count[stream]++;

				if (dev->audio_in_buf_pos[stream] == sz)

					dev->audio_in_buf_pos[stream] = 0;

			}

		}

	}



	spin_unlock(&dev->spinlock);

}



static void read_in_urb(struct snd_usb_caiaqdev *dev,

			const struct urb *urb,

			const struct usb_iso_packet_descriptor *iso)

{

	if (!dev->streaming)

		return;



	switch (dev->spec.data_alignment) {

	case 0:

		read_in_urb_mode0(dev, urb, iso);

		break;

	case 2:

		read_in_urb_mode2(dev, urb, iso);

		break;

	}



	if (dev->input_panic || dev->output_panic) {

		debug("streaming error detected %s %s\n", 

				dev->input_panic ? "(input)" : "",

				dev->output_panic ? "(output)" : "");

	}



	check_for_elapsed_periods(dev, dev->sub_capture);

}



static void fill_out_urb(struct snd_usb_caiaqdev *dev, 

			 struct urb *urb, 

			 const struct usb_iso_packet_descriptor *iso)

{

	unsigned char *usb_buf = urb->transfer_buffer + iso->offset;

	struct snd_pcm_substream *sub;

	int stream, i;



	spin_lock(&dev->spinlock);

	

	for (i = 0; i < iso->length;) {

		for (stream = 0; stream < dev->n_streams; stream++) {

			sub = dev->sub_playback[stream];

			if (sub) {

				struct snd_pcm_runtime *rt = sub->runtime;

				char *audio_buf = rt->dma_area;

				int sz = frames_to_bytes(rt, rt->buffer_size);

				usb_buf[i++] 

				 = audio_buf[dev->audio_out_buf_pos[stream]++];

				dev->audio_out_buf_pos[stream]++;

				if (dev->audio_out_buf_pos[stream] == sz)

					dev->audio_out_buf_pos[stream] = 0;

			} else

				usb_buf[i++] = 0;



		/* fill in the check bytes */

		if (dev->spec.data_alignment == 2 &&

		    i % (dev->n_streams * BYTES_PER_SAMPLE_USB) == 

		    	(dev->n_streams * CHANNELS_PER_STREAM))

		    for (stream = 0; stream < dev->n_streams; stream++, i++)

		    	usb_buf[i] = MAKE_CHECKBYTE(dev, stream, i);

		}

	}



	spin_unlock(&dev->spinlock);

	check_for_elapsed_periods(dev, dev->sub_playback);

}



static void read_completed(struct urb *urb)

{

	struct snd_usb_caiaq_cb_info *info = urb->context; 

	struct snd_usb_caiaqdev *dev;

	struct urb *out;

	int frame, len, send_it = 0, outframe = 0;



	if (urb->status || !info)

		return;



	dev = info->dev;

	if (!dev->streaming)

		return;



	out = dev->data_urbs_out[info->index];



	/* read the recently received packet and send back one which has

	 * the same layout */

	for (frame = 0; frame < FRAMES_PER_URB; frame++) {

		if (urb->iso_frame_desc[frame].status)

			continue;



		len = urb->iso_frame_desc[outframe].actual_length;

		out->iso_frame_desc[outframe].length = len;

		out->iso_frame_desc[outframe].actual_length = 0;

		out->iso_frame_desc[outframe].offset = BYTES_PER_FRAME * frame;

		

		if (len > 0) {

			fill_out_urb(dev, out, &out->iso_frame_desc[outframe]);

			read_in_urb(dev, urb, &urb->iso_frame_desc[frame]);

			send_it = 1;

		}



		outframe++;

	}



	if (send_it) {

		out->number_of_packets = FRAMES_PER_URB;

		out->transfer_flags = URB_ISO_ASAP;

		usb_submit_urb(out, GFP_ATOMIC);

	}

	

	/* re-submit inbound urb */

	for (frame = 0; frame < FRAMES_PER_URB; frame++) {

		urb->iso_frame_desc[frame].offset = BYTES_PER_FRAME * frame;

		urb->iso_frame_desc[frame].length = BYTES_PER_FRAME;

		urb->iso_frame_desc[frame].actual_length = 0;

	}

	

	urb->number_of_packets = FRAMES_PER_URB;

	urb->transfer_flags = URB_ISO_ASAP;

	usb_submit_urb(urb, GFP_ATOMIC);

}



static void write_completed(struct urb *urb)

{

	struct snd_usb_caiaq_cb_info *info = urb->context;

	struct snd_usb_caiaqdev *dev = info->dev;



	if (!dev->output_running) {

		dev->output_running = 1;

		wake_up(&dev->prepare_wait_queue);

	}

}



static struct urb **alloc_urbs(struct snd_usb_caiaqdev *dev, int dir, int *ret)

{

	int i, frame;

	struct urb **urbs;

	struct usb_device *usb_dev = dev->chip.dev;

	unsigned int pipe;



	pipe = (dir == SNDRV_PCM_STREAM_PLAYBACK) ? 

		usb_sndisocpipe(usb_dev, ENDPOINT_PLAYBACK) :

		usb_rcvisocpipe(usb_dev, ENDPOINT_CAPTURE);



	urbs = kmalloc(N_URBS * sizeof(*urbs), GFP_KERNEL);

	if (!urbs) {

		log("unable to kmalloc() urbs, OOM!?\n");

		*ret = -ENOMEM;

		return NULL;

	}



	for (i = 0; i < N_URBS; i++) {

		urbs[i] = usb_alloc_urb(FRAMES_PER_URB, GFP_KERNEL);

		if (!urbs[i]) {

			log("unable to usb_alloc_urb(), OOM!?\n");

			*ret = -ENOMEM;

			return urbs;

		}



		urbs[i]->transfer_buffer = 

			kmalloc(FRAMES_PER_URB * BYTES_PER_FRAME, GFP_KERNEL);

		if (!urbs[i]->transfer_buffer) {

			log("unable to kmalloc() transfer buffer, OOM!?\n");

			*ret = -ENOMEM;

			return urbs;

		}

		

		for (frame = 0; frame < FRAMES_PER_URB; frame++) {

			struct usb_iso_packet_descriptor *iso = 

				&urbs[i]->iso_frame_desc[frame];

			

			iso->offset = BYTES_PER_FRAME * frame;

			iso->length = BYTES_PER_FRAME;

		}

		

		urbs[i]->dev = usb_dev;

		urbs[i]->pipe = pipe;

		urbs[i]->transfer_buffer_length = FRAMES_PER_URB 

						* BYTES_PER_FRAME;

		urbs[i]->context = &dev->data_cb_info[i];

		urbs[i]->interval = 1;

		urbs[i]->transfer_flags = URB_ISO_ASAP;

		urbs[i]->number_of_packets = FRAMES_PER_URB;

		urbs[i]->complete = (dir == SNDRV_PCM_STREAM_CAPTURE) ?

					read_completed : write_completed;

	}



	*ret = 0;

	return urbs;

}



static void free_urbs(struct urb **urbs)

{

	int i;



	if (!urbs)

		return;



	for (i = 0; i < N_URBS; i++) {

		if (!urbs[i])

			continue;

		

		usb_kill_urb(urbs[i]);

		kfree(urbs[i]->transfer_buffer);

		usb_free_urb(urbs[i]);

	}



	kfree(urbs);

}



int __devinit snd_usb_caiaq_audio_init(struct snd_usb_caiaqdev *dev)

{

	int i, ret;



	dev->n_audio_in  = max(dev->spec.num_analog_audio_in, 

			       dev->spec.num_digital_audio_in) / 

				CHANNELS_PER_STREAM;

	dev->n_audio_out = max(dev->spec.num_analog_audio_out,

			       dev->spec.num_digital_audio_out) / 

				CHANNELS_PER_STREAM;

	dev->n_streams = max(dev->n_audio_in, dev->n_audio_out);



	debug("dev->n_audio_in = %d\n", dev->n_audio_in);

	debug("dev->n_audio_out = %d\n", dev->n_audio_out);

	debug("dev->n_streams = %d\n", dev->n_streams);



	if (dev->n_streams > MAX_STREAMS) {

		log("unable to initialize device, too many streams.\n");

		return -EINVAL;

	}



	ret = snd_pcm_new(dev->chip.card, dev->product_name, 0, 

			dev->n_audio_out, dev->n_audio_in, &dev->pcm);



	if (ret < 0) {

		log("snd_pcm_new() returned %d\n", ret);

		return ret;

	}



	dev->pcm->private_data = dev;

	strcpy(dev->pcm->name, dev->product_name);



	memset(dev->sub_playback, 0, sizeof(dev->sub_playback));

	memset(dev->sub_capture, 0, sizeof(dev->sub_capture));

	

	memcpy(&dev->pcm_info, &snd_usb_caiaq_pcm_hardware,

			sizeof(snd_usb_caiaq_pcm_hardware));



	/* setup samplerates */

	dev->samplerates = dev->pcm_info.rates;

	switch (dev->chip.usb_id) {

	case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_AK1):

		dev->samplerates |= SNDRV_PCM_RATE_88200;

		dev->samplerates |= SNDRV_PCM_RATE_192000;

		break;

	case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_AUDIO8DJ):

		dev->samplerates |= SNDRV_PCM_RATE_88200;

		break;

	}



	snd_pcm_set_ops(dev->pcm, SNDRV_PCM_STREAM_PLAYBACK, 

				&snd_usb_caiaq_ops);

	snd_pcm_set_ops(dev->pcm, SNDRV_PCM_STREAM_CAPTURE, 

				&snd_usb_caiaq_ops);



	snd_pcm_lib_preallocate_pages_for_all(dev->pcm,

					SNDRV_DMA_TYPE_CONTINUOUS,

					snd_dma_continuous_data(GFP_KERNEL),

					MAX_BUFFER_SIZE, MAX_BUFFER_SIZE);



	dev->data_cb_info =

		kmalloc(sizeof(struct snd_usb_caiaq_cb_info) * N_URBS, 

					GFP_KERNEL);



	if (!dev->data_cb_info)

		return -ENOMEM;



	for (i = 0; i < N_URBS; i++) {

		dev->data_cb_info[i].dev = dev;

		dev->data_cb_info[i].index = i;

	}

	

	dev->data_urbs_in = alloc_urbs(dev, SNDRV_PCM_STREAM_CAPTURE, &ret);

	if (ret < 0) {

		kfree(dev->data_cb_info);

		free_urbs(dev->data_urbs_in);

		return ret;

	}

	

	dev->data_urbs_out = alloc_urbs(dev, SNDRV_PCM_STREAM_PLAYBACK, &ret);

	if (ret < 0) {

		kfree(dev->data_cb_info);

		free_urbs(dev->data_urbs_in);

		free_urbs(dev->data_urbs_out);

		return ret;

	}



	return 0;

}



void snd_usb_caiaq_audio_free(struct snd_usb_caiaqdev *dev)

{

	debug("snd_usb_caiaq_audio_free (%p)\n", dev);

	stream_stop(dev);

	free_urbs(dev->data_urbs_in);

	free_urbs(dev->data_urbs_out);

	kfree(dev->data_cb_info);

}

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